Head to head
Ghrelin against Ipamorelin
The natural ligand and the synthetic peptide designed to copy the useful part of it. Ghrelin drives hunger and growth hormone release together; the selective agonists exist to separate those two effects.
Column A
GhrelinGhrelin (endogenous growth hormone secretagogue)
The body's own hunger hormone and the natural trigger for growth hormone release, and the template for the entire GHRP peptide class.
Column B
IpamorelinIpamorelin Acetate
A selective growth hormone secretagogue and ghrelin receptor agonist that stimulates pulsatile GH release with minimal effect on cortisol or prolactin.
Side by side, on the facts we can check
| Attribute | Ghrelin | Ipamorelin |
|---|---|---|
| Category | Growth Hormone | Growth Hormone |
| FDA status | The hormone itself is not a medicine. No ghrelin receptor agonist is approved to stimulate appetite. The one approved drug on this pathway is macimorelin (Macrilen, NDA 205598), an oral agonist approved as a diagnostic test for growth hormone deficiency rather than as a treatment, and openFDA currently lists that product as Discontinued. | Not FDA-approved |
| Half-life | ~30 minutes | ~2 hours |
| Molecular weight | 3,370.9 Da | 711.85 Da |
| Mechanism | Activates the GH secretagogue receptor (GHS-R1a) in the pituitary and hypothalamus, driving GH release and appetite. | Agonizes the ghrelin/GH secretagogue receptor (GHS-R1a) on the pituitary, stimulating pulsatile growth hormone secretion. |
| Human studies cited | 2 | 1 |
| Legal status, US | Not a medicine; endogenous signalling molecule | Not approved; research use only |
Frequently asked questions
What is the difference between Ghrelin and Ipamorelin?
Ghrelin: The body's own hunger hormone and the natural trigger for growth hormone release, and the template for the entire GHRP peptide class. Ipamorelin: A selective growth hormone secretagogue and ghrelin receptor agonist that stimulates pulsatile GH release with minimal effect on cortisol or prolactin.
Which has stronger research evidence, Ghrelin or Ipamorelin?
This database does not grade compounds. It counts what was run in people: 2 of the 5 studies cited on the Ghrelin profile were human work, against 1 of 3 for Ipamorelin. Those counts are of our own citation lists and understate any larger literature, and neither is a recommendation.
Are Ghrelin and Ipamorelin FDA-approved?
Ghrelin: The hormone itself is not a medicine. No ghrelin receptor agonist is approved to stimulate appetite. The one approved drug on this pathway is macimorelin (Macrilen, NDA 205598), an oral agonist approved as a diagnostic test for growth hormone deficiency rather than as a treatment, and openFDA currently lists that product as Discontinued.. Ipamorelin: Not FDA-approved.
Related posts
Blog articles that cover Ghrelin or Ipamorelin, newest first.
Reviewed Sep 2026. This page sets two published records side by side. It is educational, it is not medical advice, and it contains no dosing protocols or recommendations for personal use.